Berding Beton stormwater management system prevents flooding

This major project will take some more years to completion: Right in the city center of Oldenburg in Northern Germany, EWE, the regional utility group, plans to develop a completely new urban neighborhood including premises for retail outlets, service providers, housing and restaurants. The site awaiting development is situated between the Oldenburg Main Station and the Pferdemarkt, immediately adjacent to several existing EWE properties, covering an area of 4.5 hectares.

The project got the green light in early 2020 when the installation of the on-site infrastructure began under the contract awarded by EWE, including all roads, utility lines and sewer systems. Wessels und Grünefeld Ingenieurberatung, an engineering practice based in Garrel, and the Oldenburgisch-Ostfriesische Wasserverband jointly worked on the project design and engineering whereas the two civil contractors Otto Lieke GmbH & Co. KG and Meybau GmbH & Co. KG formed a consortium for executing the project.

5.7 million euro contract

One of the crucial components of the infrastructural design was to incorporate an effective stormwater management system. Previously, torrential rainfall events had proved the importance of taking the necessary precautions in order to prevent unwanted flooding and the damage resulting from it. The inner-city project site includes a high ratio of paved areas, which can cause major problems when it comes to the quick absorption and drainage of suddenly accumulating large amounts of water. This is why the project included not only precautions to ensure effective stormwater drainage but also a comprehensive range of preventive measures, such as sufficiently large detention basins for intermediate stormwater storage in order to prevent overloading of the sewer networks in the event of heavy rainfall. The project investment amounted to €5.7 million.

A sophisticated stormwater management system was conceived for the EWE site, complete with sufficiently dimensioned stormwater storage channels. Berding Beton was commissioned with delivering the full range of precast elements required for stormwater drainage. The company has many years of experience in manufacturing premium precast products for sewer systems. Its core expertise includes the production of elements tailored to customer needs. In this project, too, all box culverts, channels and manholes were custom-manufactured at the precast plant, which significantly accelerated the subsequent installation process. The contract included a total of 4,000 tons of box units as well as 1,000 tons of pipes and manholes. More specifically, the contractors installed 760 m of concrete pipe (DN 300/DN 1000) and 520 m of reinforced-concrete box culverts with the corresponding start and end sections. Some of these box units impress with their dimensions, such as a 250 m section composed of elements measuring 1,950 × 900 × 2,800 mm and weighing 12.5 tons each, or 110 m of 4,100 × 900 × 2,800 mm boxes, each with a weight of 22.5 tons.

Civil works completed on schedule

Berding Beton produced all precast units for the 17 installed stormwater channels to the highest quality standard. These watertight, buoyancy-resistant elements provide a high structural capacity as well as a high degree of flexibility. In addition, factory-installed seals create watertight joints between the box culverts. This impervious design relies on a glued-on, wedge-shaped sliding seal conforming to the EN 681-1 standard and a shear transfer element in different Shore hardnesses. This joint is watertight under both internal and external pressure of up to 1.00 bar.

Since water is a valuable asset, it should be handled in an environmentally friendly yet commercially viable manner. This is why the start and end sections of the stormwater channels were equipped with silt traps. A 31.4 ton flow-restricting structure comprising two DN 200 gates and a steel restrictor was installed in order to ensure controlled release of the stormwater from the detention reservoir. Berding Beton also delivered two custom emergency overflow systems measuring 2,000 × 2,000 × 2,100 mm and 2,000 × 2,000 × 2,200 mm, respectively. In this project, the civil contractors greatly benefited from Berding Beton delivering all items on schedule, thus saving valuable space on the job site, but also from the fact that the elements were installation-ready when arriving on-site.

In addition, the members of the Berding Beton staff ensured swift problem solving if and when required. As a result, all challenges were overcome in a joint effort, which allowed for timely completion of the civil works at the end of 2020.

Berding Beton GmbH
Industriestr. 6
49439 Steinfeld/Germany
+49 5492 87-24

Related articles:

Issue 11/2012 Berding Beton GmbH

Egg-shaped pipes for combined sewer

A combined sewer has recently been rebuilt in the German city of Oldenburg. Egg-shaped reinforced-concrete pipes manufactured by Berding Beton GmbH in compliance with the quality guidelines of the FBS...

Issue 05/2020 BERDING BETON

Water inlet made of concrete for Rotterdam’s Leuvekolk

Work for a complete revamping of the Leuvekolk in the Dutch port of Rotterdam has been underway since last year and is expected to be completed in 2020. The Leuvekolk is a spur of the Rotte River,...

Issue 08/2021 BERDING BETON

Environmentally friendly sewer construction measure at 30-m depth

The public utilities company Stadtwerke Essen in Germany already began with renewal of the Wolfsbachtal sewer system in the summer of 2018. By now, most of the comprehensive construction measure has...

Issue 11/2018

Patented high-performance reinforced concrete pipes for Antwerp infrastructure project

About 850,000 inhabitants in and around Antwerp will benefit from the elaborate infrastructure project. The objectives pursued by the „Antwerp Master Plan 2020“ include: to solve the problem of...

Issue 11/2023

Berding Beton supplied “Verkalit”-system for dike rehabilitation on Borkum

For many centuries, dikes have protected land and people from the elemental forces of the sea. Effective protective measures have thus always had an important significance, which has increased again...